Egila, Hossam, Zeinab El-Mahdy, Ahmed Azab, Mohamed Abu-Hegazy, and Ayman Abdel-Naby. “Sodium Valproate Versus Propranolol in Chronic Migraine Prophylaxis”. International Neuropsychiatric Disease Journal 14, no. 3 (October 2, 2020): 22-30. Accessed October 20, 2020. https://journalindj.com/index.php/INDJ/article/view/30130.